I have that P2store and 64 GB cards. And while you cannot download the cards onto the P2 store, what I do is open Final Cut, then hook up the P2 store to my mac. I insert the card (it should appear on the Mac desktop, but I don’t use that). Then on Final Cut I go to FILE > Log and Transfer. Then files on the P2 card show up on the Log and Transfer and I select which files to bring into Final Cut, I also dupe those files onto another hard drive so that I have a backup for when I have to erase the P2 card.